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Can someone please explain

Name: Anonymous 2008-05-31 23:31

Why 0! = 1

also 1/0!

Name: Anonymous 2008-06-01 3:00

x! = (x!) * 1
3! = (3*2*1) * 1
2! = (2*1) * 1
1! = 1 * 1
0! = 1

This may not be the best explanation but it's how I've always thought of it.

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